Improvement in the manufacture of knife-blades



2 Sheets-Sheet 1L a. M. MOORE. Manufacture of Knife Blades.

Patented April 9,1878.

. WITNESSES:

ATTORNEYS.

N-EETE RS. PHOTO-LITHOGRAFHER WASHINGTON n c Sheets-Sheet 2 MOOR ure ofKni s M 31 Manufaot fe Blades. No. 202,282. lj gtented Aprll 9, 1878.

UNITED STATES PATENT OFFICE.

SILAS M. MOORE, OF OANASTOTA, NEW YORK, ASSIGNOR TO WILLIAM HURLBUT, OFSAME PLACE. j

IMPROVEMENT IN THE MANUFACTURE OF KNIFE-BLADES.

Specification forming part of Letters Patent No. 202,282, dated April 9,1878; application filed October 25, 1877.

. &c., by means of trip or drop hammers, driven by any motive power,from rod-steel, and

, in such manner that the grain of the steel at the junction of theblade and tang will not be injured or destroyed, thereby remedying acommon defect in blades produced by handforging..

The invention will first be described in connection with the drawing,and then pointed out in the claims.

In the accompanying drawings, which form a part of this specification,Figure 1 is a plan view of the stationary or bed dies; Fig. 2, avertical section of same at the line as m; Fig. 3, a side elevation ofthe upper and lower dies in place upon each other. Fig. 4: is atransverse section of the upper and lower dies at the line 4. 4, Fig. 3;Fig. 5, a transverse section of same at the line 5 5; Fig. 6, atransverse section of same at the line 6 6; Fig. 7, a transverse sectionof same at the line 7 7 Fig. 8, a transverse section of same at the line8 S; Fig. 9, a transverse section of same at the line 9 9.

As illustrated in the drawings, A is the bed in which the lower dies Bare secured, and O the hammer-head, to which the upper dies D aresecured. The dies are placed in dovetailed grooves formed in the bed andhammerhead, and are secured by keys E, driven into the grooves by theside of the dies. Several of the dies,being placed in the same groove,are all secured by asingle key. The lower dies B are adjusted tocoincide with the upper dies 1) by the bars F, attached to the sides ofthe.

bed A by set-screws G. The upper ends of these bars project into thegrooves in said bed, and bear against the ends of the dies B, as shownin Fig. 6, so that by turning the screws G at either side, as may berequired, the dies B can be quickly and accurately adjusted to theirproper places. The upper dies D are retained in their places by thedowel-pins H, which are inserted in their backs and into the hammerheadG.

The parts of the dies for forming the tangs are changeable, so thattangs of different sizes may be formed on blades of the same size. Theseparts are held in place and adjusted by set-screws I.

The operation of forging by these dies is as follows: The. end of thesteel rod is heated and narrowed on its point in the dies B D theshoulders are cut on the dies B D, and the rod is drawn out andflattened in the dies 13 D It is then narrowed in dies B D, againflattened in dies B D", again narrowed in dies B D, and flattened andsmoothed in dies 13 D. It is then drawn to an edge in dies B D Thenail-nick is formed on the nick-chisel B. It is again straightened inthe dies 13 D, B D, and B D and is cut off by the chisel B", a perfectedforging, ready for the subsequent operations of grinding and finishing.

In forging knife-blades by hand, in reducing the thickness of the metalWhere the heel of the blade joins the tang, and in forming thecuttingedge of it, it is the universal practice of all smiths to drivethe metal over to one face of the tang until the required thickness andbevel of the blade is obtained, andthen to drive it back again until thethin edge is brought to the center of the edge of the tang. In doingthis it is manifest that the perfect cohesion of the grain of the metalat this point is greatly impaired if not entirely destroyed, and fromthis cause proceeds the fracture of the blade at this point so commonwhen subjected to the slightest strain. This defect is entirely remediedby my mode of forging blades, for the reason that the reduction of themetal at the point referred to is produced uniformly from both sides andat the same instant, whereby the grain of the metal, instead of beinginjured, is greatly improved by being condensed in the process ofhammering.

. Having thus described my invention, I claim as new and desire tosecure by Letters Patent- 1. In the manufacture of knife-blades, the

combination of the series of dies, substantially as herein described,for producing by sucterchangeable pieces, secured therein forvarycessive forgings knife-blades, in the manner ing the size and shapeof the tang of the set forth. blades, as set forth. 2. The combination,with bed and anvils, ggttifigrtifiars F, applied as and for the purposeSILAS 2 MARKHAM MOORE.

, k. 3. The combination of the dowel-pins H with mm the dies D and thehammer-head G, substan- Witnesses: tially as herein shown and described.EDITH MOORE,

4. The combination, with the dies B, of in- J. H. BELL.

